Electro-magnetic car-brake



(No Model.)

H. S. PARK.

ELEOTRO MAGNETIC OAR BRAKE.

Patented Mar. 31, 1885.

FIG

N. versus Pholoblhagrapher. Wash ngton. 0. c.

Nrrn STATES PATENT much,

HARVEY S. PARK, OF HENDERSON, KENTUCKY.

ELECTRO-MAGNETIC CAR-BRAKE,

SPECIFICATION forming part of Letters Patent No. 314,709, dated March 31, 1885.

Application filed June 3, 1884. (No model.)

To all whom it may concern.-

Be it known that I, HARVEY S. PAR-K, a citizen of the United States, residing at Henderson, in the county of Henderson and State of Kentucky, have invented certain new and useful Improvements in Electro-lvlagnetic Oar- ?rakes, of which the following is a specificaion.

The invention relates particularly to means of throwing braking mechanism in and out of action by electro-magnetic agency, to means of locking the brakes to any desired point of application no matter what the direction of movement be when the brakes are applied, and to means operated by electro-magnetic devices for throwing such locking mechanism out of operation to release the brakes.

In order that my invention may be more fully understood, I will proceed to describe it with reference to the accompanying drawings, in which Figure I is a vertical section of one end of a car'truck to which my invention is applied. Fig. II is a vertical sectional view of the looking mechanism to a larger scale, the right and left sides of said figure showing, respectively,

one-half of oneof a pair of annular racks.

Fig. III is a vertical sectional View at right angles to Figs. I and II of the brake-chain winding, locking, and unlocking mechanism. Fig. IV is a detail view of one of the lockingpawls.

1 2 represent the beams of a railroadcar gruck of any ordinary or approved construcion.

3 is a car-wheel, and 4 the axle of said wheel. Keyed or otherwise fixed to said axle is a disk or roller, 5, having V-shaped grooved frictional surface.

6 are hangers or supports for the brakechain windlass and lockingand unlocking mechanism, said hangers being rigidly attached tonne of the truck-beams, as shown. One of the hangers 6 is made circular, or nearly so, in contour, so as to cover the open head of the cylinder 7, which is fixed to axis 8, said hanger 6 serving to protect the mechanism within the cylinder from dust, The axis 8 is mounted at its ends in the hangers 6, and serves as wind] ass forthe brake-chain 9,whioh is wound on said axis between the collars 10. Ears 11 are formed on the lower edge of the with the shaft 13 by a short link, 15. necting rod or chain, 17, unites the longer I hangers 6, and provided with inclined slots 12, which serve as bearings for the ends of shaft 13, upon which is mounted asecond friction disk or roller, 14, having projecting V-, shaped frictional'surfaoe to occupy the groove in the roller 5. A similar Vshaped groove is formed on the periphery of the cylinder 7. A bell-crank lever, 15, is I'ulcrumed at 16 on the hanger 6, and has its shorter arm connected A conarm of the lever to the movable suction-core or armature 18 of a hollow magnet, 19, mounted on hanger 6, and having electrical connection with the generator on the locomotive or other portion of the train. This circuit being under the control of the engineer or conductor, it

. will be seen that at any time a current may be thrown through the magnet 19, by which means the idle friction-roller 14 will be thrown into frictional contact with the disk 5 and cylinder'7, and the motion of the car-wheel axle be thus employed in winding up the brakechain in one or the other direction, according to the direction of motion of the train, and

thus effecting the application of the brakes. The interior of the cylinder 7 is provided with a pair of annular racks, 2O 21, placed parallel to each other, and having theirteeth inclined in opposite directions, so as to be engaged by turned pawls 2223, respectively. The pawls 22 23 are mounted upon the same stud or pin, 24, fixed to and projecting inward from the hanger 6. The heads 25 of the pawls 22 23 are made heavier than the toes, so that when thrown beyond their pivotal point they will be held by gravity in that position until returned to engagement with the ratchets 2O 21 by the arm 26. Said arm 26 is provided at its lower end with a flexible spring-plate, 27, is pivoted at or about its center to the axis 8, and is provided at its upper end with an antifriction roller orwheel, 28, running on pivots 29. Pins or studs 30 31, fixed to the inside of the hanger 6, project into the path of the arm 26, so as to limit its motion in each direction. Pins 32 are provided on the heads 25 of the ratchets 22 23, to be engaged by the spring 27 during the oscillation of the arm 26.

The operation of this locking mechanism is as follows: The pawls,having been thrown out of engagement with their ratchcts after the last braking operation, rest with their heads slightly elevated in the path of the spring 27. The cylinder 7, having been set in motion by the clutch mechanism before described, will 5 carry with it in its rotation the wheel 28, and

by the friction on its pivot 29 will force the arm 26 around in the same direction until it strikes one or the other of stops 30 31, according to the motion of the train. In its passage lOI'he spring 27 on arm 26 will throw down into engagement with its ratchet that pawl standing in its path, which pawl will remain in engagement with its ratchet during the rotation of the cylinder 7 until the desired force of I 5 brake application is attained, and the clutch is released by switching off the current from magnet 19. On the release of the pawls, in a manner presently to be described, the arm 26 is returned to central position between the ratchets 22 23 by spring on the windlass or brake beam, or weight on the arm itself. When the arm 26 is oscillated to one side or the other till it strikes one of the stops 30 31, the anti-frictional roller 28 serves to prevent 25 friction between the arm and the cylinder 7 by running freely with said cylinder in its continued rotation. A second hollow magnet, 33, is mounted at the top or other suitable portion of the frame 6, and has the movable o corearmature 34, connected by brass rod with the upper long end of bell-crank lever 36, fnlcrumed at 37 to the hanger 6, and having forked arm 38, projecting through said hanger, one beneath each of the pawls 22 23.

5 The coil of magnet 33 having electrical connection throughout the train under the control of the conductor or engineer, it will be seen that when a current is thrown through said coil the armature 34, being attracted, will 0 lift one or the other of the pawls 22 23 from engagement with its ratchet, thus unlocking the cylinder 7, and permitting the'bra'kechain to'unwind and release the brakes. The unwinding of the brake-chain will force the cylinder7 in a contrary direction, carrying with it the arm 26, which gravitates by the weight of its lower portion until it assumes a posi- 7 tion between the heads of the pawls 22 23. When said pawls are lifted on the forked arm 38 by the unlocking-lever, their heads are thrown beyond the pivotal point, so as to rest disengaged until again thrown down'by the impact of spring '27.

Having thus described my invention, the following is what I claim as new therein and described,'between said-Windlass and'the truckaxle, and fixed hangers or supports having circular bearings for said Windlass, and slotted bearings for the intermediate friction-roller,

substantially as and for the purpose set forth.

2. In an electro-magnetic car-brake, the

combination of a roller having capacity for v lateral movement, an electro-magnet, a movable armature therefor, and a bell-crank lever pivoted to a fixed portion of the frame, having connection at one end to said armature, and bearing beneath or surrounding the axis of said roller at its other end, substantially as and for the purpose set forth.

3. In combination with a system of brakebeams, levers, Windlass, and chain, a friction disk or roller fixed to the truck-axle, a second friction-disk on the brake-chain Windlass, a third friction-disk on a shaft intermediate between the truck-axle and Windlass, hangers fixed't'o the truck-beams,'and having circular bearings for the Windlass and slotted bearings for the journals of said intermediate shaft, and a bell-crank lever pivoted to one of said hangers,bearing beneath the said intermediate shaft at one -end,*and having means of actuating its other end to apply or release the brakes, substantially as set forth.

4. In combination with a brake-chain windlass, a cylinder or roller having rigid connec-- tion therewith, means for imparting rotation thereto in one or the other direction,according to the direction of motion of the train, apair of racks having teeth inclined in opposite directions, and a pair of oppositely-turned pawls for looking said cylinder or roller in position at the proper point of brake application and in .either direction of rotation thereof, substantially as set forth.

5. In combination with brake-chain windlass, cylinder, or roller having rigid connection therewith, and means for imparting motion from the truck-axle in one or the other direction to said cylinder or roller, the fixed hangers or supports having bearings for said windlass, and double ratchet and pawl arranged to lock the cylinder in either direction at any-desired point of brake application, substantially as set forth.

6. In combination with the cylinder having rigid connection with the brake-chain wind-. lass, and carrying oppositely-faced ratchets, the fixed hangers having oppositely-turned pawls arranged to engage said ratchets and means of tripping said ratchets, for the purpose set forth.

7. In combination with the brake-chain windlass and a cylinder or rollerhaving rigid connection therewith and carrying oppositelyfaced ratchets, the fixed hangers or supports and the oppositely-turnedpawls pivoted-thereon, said pawls having weighted heads, arranged substantially as described.

8. In combination with a cylinder or roller and mechanism for imparting rotary motion thereto to effect the application of the brakes, locking pawls and ratchets, and a pivoted arm having frictional contact with said roller at one end, and extending between said 'pawlsat the other end when in a state of rest, substantially as and for the purpose setforth.

'9. In combination with a cylinder or roller, mechanism for impartingmotion in one or the other direction to said cylinder or roller to effect the application of the brakes and locking pawls and ratchets, the pivotal arm extending between said pawls at one end,and having antifriction wheel or roller at the other, substantially as set forth.

10. The combination, with the rotary cylinder or roller on the brake-chain wind1ass,having ratchet-teeth, substantially as described, and the pawls for engagement therewith, ofthe arm pivoted to said Windlass and carrying antifriction wheel or roller at one end, and the stops fixed to the Windlass supporting frame or hanger on each side of the said arm to limit its motion, substantially as set forth.

11. In combination with the locking-cylinder, pawls, and ratchets, the pivotal arm having a plate-spring fixed to one end projecting between said pawls when at rest, and suitable means for imparting oscillation to said arm, substantially as set forth.

12. In a brake apparatus, the combination of a rotary shaft, two sets of ratchet-teeth inclined in opposite directions, a pair of pawls,

means for throwing either of them into engagement with its ratchet, and a tripping device for freeing said pawls, operated by an electromagnet, as set forth.

13. In combination with the locking-cylinder, pawls, and ratchets, the pivotal trippingiever, 'electro-magnet, movable armature, and transmitting mechanism, substantially as de' scribed.

14. The combination, with the rotary cylinder or roller having the ratchet-teeth, substantially as described, and the pawls for engaging therewith, of a tripping-lever for engaging with said pawls, a hollow magnet, a movable core armatnre, and means for transmitting motion from said armature to said lever, as described.

HARVEY S. PARK.

YVitnesses:

R. H. CUNNINGHAM, V J. D.WALBRIDGE. 

